Magnetic mapping of defects in type-II superconductors
arXiv:1606.01087 · doi:10.1063/1.4952617
Abstract
Recently it was discovered that the non-uniform Meissner current flowing around the pinning sites in the type-II superconductor induces the unconventional vortex-antivortex pairs with the non-quantized magnetic flux [J.-Y. Ge, et al., Nat. Commun. 6, 6573 (2015)]. Here we provide the theory of this phenomenon showing that the vortex-like structures originate from the perturbation of the current streamlines by the non-superconducting defect, which results in the generation of the localized magnetic field. The position and the shape of such vortex dipoles are shown to be very sensitive to the defect form. Thus, applying the external magnetic field or current to the superconductor and using, e.g., the high-resolution scanning Hall microscope to measure the stray magnetic field one can plot the map containing the information about the position of the defects and their shape.
arXiv comment4 pages, 3 figures
References in corpus (9)
- The Ginzburg-Landau Theory of Type II superconductors in magnetic field
- Suppression of Superconductivity by Twin Boundaries in FeSe
- Strongly Enhanced Vortex Pinning by Conformal Crystal Arrays
- Enhancing the Critical Current of a Superconducting Film in a Wide Range of Magnetic Fields with a Conformal Array of Nanoscale Holes
- Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates
- Enhancement of pinning properties of superconducting thin films by graded pinning landscapes
- Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density
- Highly Effective Superconducting Vortex Pinning in Conformal Crystals
- Enhancing superconducting critical current by randomness